A) \[{{H}_{5}}{{C}_{6}}-\overset{O}{\mathop{\overset{\parallel }{\mathop{C}}\,}}\,-C{{H}_{2}}-\overset{O}{\mathop{\overset{\parallel }{\mathop{C}}\,}}\,-{{C}_{6}}{{H}_{5}}\]
B) \[{{H}_{5}}{{C}_{6}}-\overset{O}{\mathop{\overset{\parallel }{\mathop{C}}\,}}\,-C{{H}_{3}}\]
C) \[{{H}_{5}}{{C}_{6}}-\overset{O}{\mathop{\overset{\parallel }{\mathop{C}}\,}}\,-H\]
D) Both [a] and [b]
Correct Answer: D
Solution :
[d] Keto-enol tautomerism is shown by carbonyl compounds having \[\alpha \]-hydrogen atom. [a]
[b] 
[c] 
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